Need help with procharger

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Jul 29, 2008 | 11:30 PM

Garrett114

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Instructor

Joined: Mar 2008

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From: Breaux Bridge La

Need help with procharger

I just installed MTI 241 heads and TR blower cam. Before the car made 9# of boost with a 3.5 pully old style kit. When I started it today and tuned it I was only making 5-6# of boost. What size pully I need to get back to least 8#s

Setup:stock bottom, ported TB, ported fast 78, stage 2 MTI 241,TR blower cam 214/230 601/579 117lsa, yella terra 1.7,old school procharger kit

Jul 30, 2008 | 08:49 AM

Garrett114

Thread Starter

Instructor

Joined: Mar 2008

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From: Breaux Bridge La

any help would be grateful

Jul 30, 2008 | 09:04 AM

glennd

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From: Upton MA

A 3.00" pulley will get you about 2 lbs above your present 5-6#s

Jul 30, 2008 | 10:16 AM

03blackZ06

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From: Tampa Fl

3.2?

Jul 30, 2008 | 06:32 PM

leojnknsC5

Melting Slicks

Joined: Sep 2005

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From: eagle mountain utah

3.5 to 3.2 will get approx 3 psi. Its one tenth of an inch per pound.

Jul 30, 2008 | 07:33 PM

glennd

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From: Upton MA

a 10% change in pulley diameter is not going to get you the 35% change you are looking for.

Jul 30, 2008 | 08:22 PM

0EPP

Former Vendor

Joined: Dec 2006

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On the stock bottom end I wouldn't go past 7 psi with the better flowing heads and cam. I'd go to a 3.40 pulley, any smaller and you may end up having belt slippage problems. Bob